Add support for the column-fill property.

LayoutTests/fast/multicol/column-count-with-rules.html

Index: LayoutTests/fast/multicol/column-count-with-rules.html
diff --git a/LayoutTests/fast/multicol/column-count-with-rules.html b/LayoutTests/fast/multicol/column-count-with-rules.html
index b1229a0662a4121d173c3755f177c19191f362c4..5af26d0580027fd93ab01908f662e84e1d8c8b0c 100644
--- a/LayoutTests/fast/multicol/column-count-with-rules.html
+++ b/LayoutTests/fast/multicol/column-count-with-rules.html
@@ -1,4 +1,4 @@
-<p style="-webkit-column-count:3;-webkit-column-rule:3px solid black; height:100px;border:10px solid maroon; padding:20px;">
+<p style="-webkit-column-count:3; -webkit-column-rule:3px solid black; column-count:3; column-rule:3px solid black; column-fill:auto; height:100px; border:10px solid maroon; padding:20px;">
 This is some column text.<br>
 This is some column text.<br>
 This is some column text.<br>
@@ -14,7 +14,7 @@ This is some column text.<br>
 This is some column text.<br>
 </p>
 
-<p style="-webkit-column-count:3;-webkit-column-rule:3px solid black; height:100px;border:10px solid maroon; padding:20px; direction:rtl">
+<p style="-webkit-column-count:3; -webkit-column-rule:3px solid black; column-count:3; column-rule:3px solid black; column-fill:auto; height:100px;border:10px solid maroon; padding:20px; direction:rtl">
 This is some column text.<br>
 This is some column text.<br>
 This is some column text.<br>